Box Gutter

Unlike eaves gutters that are visible on the outside of the building, box gutters are hidden within the roof structure. They are formed by creating a flat-bottomed channel between two adjacent roof surfaces, typically lined with Colorbond steel, Zincalume, or a waterproofing membrane. Box gutters are common on older homes where additions have been built, creating an internal valley between the original roof and the new section, and on commercial buildings with parallel roof ridges. Box gutters present unique challenges compared to eaves gutters. Because they are concealed, leaks may go undetected for extended periods, causing significant hidden damage to structural timbers and ceilings. They also have a much larger catchment area relative to their size, meaning they handle high water volumes. Australian Standard AS/NZS 3500.3 requires box gutters to be designed with a minimum fall of 1:200 and to include an overflow provision in case the primary outlet becomes blocked. In Gippsland, box gutters are one of the most common sources of persistent roof leaks, particularly on older homes and commercial buildings. The original galvanised or lead linings corrode over time, and inadequate fall or undersized outlets can cause ponding and overflow during heavy rain. Town & Country Roofing specialises in box gutter repairs, re-lining, and waterproofing — often transforming a chronic leak source into a reliable drainage component.